Following, because I need tips too. I tried my baby girl with a flat pillow and cot duvet and she woke up within 2 hours 🙃 My cousin was in the same boat with the cosleeping and she put the L shaped pregnancy pillow in the cot and she said it worked like a dream
My boys slept with a duck feather pillow for the last couple of months as it’s the only thing that settles him. He uses a dummy which is in a lot of the night. He’s In my room right next to me and I check him constantly through the night as I’m a bad sleeper. He also sweats so sleeps in just a sleep suit and has a blanket on the cold nights that is below his arms. Again has done for months. When he rolls off the pillow I take it out the cot - it’s just how we work, and I’ll do what I can to let him have peace. (Yes I’m fully aware of SIDS before anyone says anything 😩)
When babies are 1 it's okay to have a duvet, pillow and soft toys. Does she have a soft toy that she's attached to? If so, that could be a good suggestion. Cot only needs to be empty when they are under 1 x